Accuracy of Point Precipitation Measurements

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Abstract
The normal-exposed Hellmann raingauge only catches about 85% of the true precipitation on yearly basis. This is mainly due to aerodynamic effects. A statistical model analysing the ratio of the daily amounts of precipitation measured at ground level and at standard height is set up for describing this influence. Corrections due to liquid and solid precipitation and three different kind of exposures are presented. Further the statistical errors on the corrections are estimated.

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